The resting-state cerebro-cerebellar function connectivity and associations with verbal working memory performance

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Functional Neuroimaging

Background:

• The cerebellum's role in cognition is increasingly recognized, yet its resting-state functional connectivity (FC) with cerebral cortical areas and its impact on cognitive functions like verbal working memory remain unclear.
• Understanding cerebro-cerebellar circuit dynamics during rest is crucial for elucidating the neural underpinnings of complex cognitive processes.

Purpose of the Study:

• To investigate resting-state functional connectivity (FC) patterns in human cerebro-cerebellar circuits.
• To examine the association between these FC patterns and verbal working memory performance using an n-back task.
• To identify key cortical hubs and their connectivity characteristics related to cognitive function.

Main Methods:

• Utilized resting-state functional magnetic resonance imaging (fMRI) data from 34 healthy participants.
• Employed whole-brain connectivity analysis to identify cortical hubs as regions of interest (ROIs).
• Conducted ROI-based FC analysis to assess connectivity within identified hubs and correlate with n-back task performance.

Main Results:

• Identified bilateral cerebellum lobule VI as central hubs with increased FC to default mode network (DMN) and salient network (SN) nodes.
• Observed decreased FC between cerebellum lobule VI and executive control network (ECN) nodes.
• Found significant correlations between FC values of cerebellum lobule VI with DMN and ECN nodes and verbal working memory performance (2-back task response time).

Conclusions:

• Cerebro-cerebellar circuits exhibit distinct resting-state FC patterns involving the DMN, SN, and ECN.
• These resting-state connectivity patterns are associated with individual differences in verbal working memory capacity.
• The findings suggest that cerebro-cerebellar circuits contribute to the neural basis of verbal working memory processing even during rest.